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littlekinghunter
Copper Member
Canada
4 Posts |
 Posted - 09/29/2009 : 03:22:45
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Hey all, got a head scratcher (for me at least...)
So three tunes into practice tonight, I notice a drop in both gain and volume from my amp. I thought "hmmmm, what's causing that?". Nothing appeared to be wrong with anything until the intro of the next song, which required a delay setting where the feedback control is cranked (not a subtle effect). That's when I noticed there was no effect all.
NONE of the delay options produced any effect when they were selected, and yes the unit had power and no controls were zeroed by accident.
This appears to be a multifaceted problem; the delay type selector is obvious not working and being that the unit has true bypass (I assume...?) I wonder why the drop in gain and volume still occurs when the DD-3 is turned off.
Anyway, took the pedal out of the chain and reconnected everything else and boom, amp was loud and clear again.
Has anyone ever run into this kinda problem with their own DD-3?
The pedal is pushing 4 to 5 years old and has been used A LOT. Further, the pedal runs on a shared adaptor for all the 9v devices on the board (there are 4 in total), not on a dedicated battery.
Thanks in advance if you've got any ideas.
Luke |
Edited by - Dr. Bob on 09/29/2009 15:11:32 |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 09/29/2009 : 04:13:46
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Welcome to the forum! Some people here are bound to have better ideas than me.. but usually we suggest trying the pedal on its own with a known good battery. If that fails, it very well could be a component inside which needs replacing.
Boss pedals aren't true bypass (but do a good job bypassing in most circumstances), so without any power, you shouldn't get a signal passing through the pedal. I had an old DD-3 which passed signal but had no effect as well - it was repaired by Roland Canada a bunch of years ago (and wasn't too expensive either). If you're handy with a soldering iron and multimeter, the guys here can probably suggest some components to check for continuity..
Good luck! Hope you can get your workhorse delay back in action! |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 09/29/2009 : 06:06:52
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Welcome!
I've seen a couple of these with dead output opamps. A quick test you can do - plug into the "direct out" and see if that is working OK. |
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 09/29/2009 : 13:45:08
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| Welcome to the forum |
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littlekinghunter
Copper Member
Canada
4 Posts |
Posted - 09/29/2009 : 13:59:59
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thanks everyone, gonna get cracking on the problem tomorrow, I'll let you know how it works out
hey I may as well plug my band (just once) myspace.com/littlekinghunter add us! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/29/2009 : 15:00:05
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Hi
Welcome to the forum from Australia.
If you go back & edit your profile, you will be able to add your,
bands myspace URL to the Homepage field.
Do you have some electronic tools-soldering iron & any related skills?
That info will give us some idea of the depth our our responses.
As you may be well aware, it can be difficult to do remote diagnostics & repair.
It may be as simple as dirty in-out jacks, loose wires,
or as difficult as board level component replacement.
BTW, you failed to mention which revision/version of the DD-3 you own.
Good luck with the DD-3.
Regards Dr. Bob  |
Edited by - Dr. Bob on 09/29/2009 15:03:46 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 09/29/2009 : 15:10:28
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Moved to:
Modifications and Technical Issues - Moderator. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 09/29/2009 : 15:25:23
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quote:
Originally posted by Dr. Bob
BTW, you failed to mention which revision/version of the DD-3 you own.
At 4-5 years old I'm guessing the current model? |
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chrissydamage
Silver Member
United Kingdom
180 Posts |
Posted - 10/04/2009 : 01:46:30
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Hey Luke welcome to the forum!!
I think this may well be a common fault with the DD-3, I've got a couple of them here with *exactly* the same fault, saw another one too go on ebay last week in the same condition here in the UK-
Unfortunately I have no idea what the fault is either!!
The direct outputs work fine, does this mean the output opamp has possibly had its chips?
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 10/04/2009 : 03:06:25
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quote:
Originally posted by chrissydamage
The direct outputs work fine, does this mean the output opamp has possibly had its chips?
Yes. Probably... |
Edited by - Laurie on 10/04/2009 06:35:36 |
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chrissydamage
Silver Member
United Kingdom
180 Posts |
Posted - 10/04/2009 : 16:31:17
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Sweet- probably or possibly is definately good enough for me :D
Opamps all round then....
Nothing ventured nothing gained- been sat on these things for so long I'd pretty much written them off!!
I'll update and let know if it works or not- may take me a little while to obtain the parts and fit them realistically :)
Thanks Laurie!! |
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leonard d rock
Silver Member
Philippines
301 Posts |
Posted - 10/05/2009 : 11:32:25
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on my dd3 which has the same no problem, i changed d9, the one with a new one and it works fine. if i use batteries, that diode doesnt burn out, but if i use power, the diode "burns". i don't know what causes this. i'm using it on batteries now.
ldr |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/05/2009 : 13:21:39
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Hi leonard d rock
In case you were not aware, there are several different versions of the DD-3
Not to mention,
the diodes in early long chip DD-3's & the Digital Square chip version of the DD-3, are DIFFERENT parts.
Early DD-2-3 long chip version is an 11V 1Watt axial leaded Zener,
& the Digital square chip is an SMD 1Amp general purpose rectifier.
In the case of a DD-3 with a D9 surface mounted diode, the parts list
for the 2002 revision lists D9 as a GS1G
The simple spec. for this part is a 1Amp rectifier SMD package.
You may have accidentally replaced it the wrong way around.
or you may have accidentally used the wrong part.
from the circuit diagram I'm guessing the the first.
Considering that you mentioned that your DD-3 operates correctly on 9V batteries.
There is another possible explanation/reason....
Have you checked the polarity of the power pack you were using?
It has to be Negative on the tip(centre pin).
To verify, you can use a cheaper standard axial lead 1N4002-4-7 type 1amp diode.
with the case open & the PCB exposed -
--- Carefully ---
Remove the D9 that you replaced & solder it in its place,
leave the leads long in case it starts to overheat for some reason,
that we have not foreseen yet.
Or maybe upload some pics of the affected area, to see if we can help you out.
There are some pics in the "Pedal Internals" pages that might help you out.
Pages 10 & 12 for the DD-3 digital SMD square chip versions.
Page 10 - uploaded by member - ugufru:
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=10
Page 12 - uploaded by member - Laurie:
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=12
Page 1 for the long chip version - uploaded by Admin - Bossarea:
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=1
Good luck
Regards Dr. Bob |
Edited by - Dr. Bob on 10/05/2009 13:25:10 |
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leonard d rock
Silver Member
Philippines
301 Posts |
Posted - 10/06/2009 : 03:06:16
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thanks for the headsup Dr. Bob.
i'll check on it this weekend
Mabuhay!
ldr |
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littlekinghunter
Copper Member
Canada
4 Posts |
Posted - 10/06/2009 : 03:20:48
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| Thanks for all the suggestions. I have sent it off to Roland Canada for a repair and was lucky enough to get a very cheap rental of a brand new dd-3 (only $16/month) until it comes back. |
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sudden malfunction of DD-3
